TRASCO®

JUBOFLEX®
TRASCO® Couplings

“P” COUPLINGS
BOLT COUPLINGS
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TRASCO® couplings
Description
TRASCO® flexible couplings consist of two metal hubs and an small shaft length variation.

TRASCO 
TRASCO 
elastic gear ring which is resistant to oils, chemical agents and The involute profile of the gear ring teeth prevents high stress
heat. The construction allows safe power transmission between concentration on reduced surfaces and the crowned profile
driver and driven shafts, absorbing impact loads, and torsional avoids the transmission of axial stress.
vibrations. The high duty factor of TRASCO® couplings is due to the fact that
In its class TRASCO® coupling transmits more power in relation the elastic element works under compression and never under
to the physical space occupied. flexion.
It has a very compact design and allows safe power transmission TRASCO® couplings are suitable for working in both horizontal
by absorbing peak loads and torsional vibrations. and in vertical positions and easily support any load variation or
Moreover, the elastic deformation of the polyurethane gear ring reversal. The two coupling halves are electrically insulated from
compensates angular and radial misalignments and also absorbs each other.

“A” execution Spider “B” execution “BL” execution

ATEX 94/9/EC compliance

It is possibile to ask for specific certification for use in hazardous available with specific mounting/operating instruction manual and
area according to EC standard 94/9/EC. TRASCO couplings are conformity. For information, please contact our technical office.

Hubs are available in cast iron GG25, die cast aluminum alloy or deburred.
forged aluminum. The “S” version allows lower axial displacement as indicated in the
Special request hubs are available in steel or cast iron GGG40. technical performance table. Each hub is available in two types
In the base execution, “GR” TRASCO® couplings are available in “A” and “B”, which can accommodate maximum bore size in
two different versions: precision “P” or economy “S”. mm corresponding respectively to the first and second number of
In all other executions, only the precision type is manufactured. the coupling designation.
The difference between “P” and “S” type hubs is that in the Besides the various executions shown in the catalogue, it is
precision execution the circular sections of the hubs are precision always possible to manufacture coupling hubs for special
machined, while in the economy execution, they are simply applications.

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Spider

The gear ring is made of a particular polyurethane resin which to the main chemical agents, acids, oils, and ozone.
shows great advantages in comparison to the standard polyu- Special types of gear rings are available in order to provide the
rethans on the market. right solution for each specific application covering a large range
In fact it is very resistant to aging and hydrolysis (therefore, also of temperatures and resisting specific chemical agents.
suitable for tropical climates) as well as fatigue proof and
abrasion proof. It is self-dampening and shows a great resistance

Standard spiders
Admissible Temperature
[°C]
(Shore) Colour Compound Applications
on work peaks

92 Sh A Yellow Polyurethane from - 40 to + 90 from - 50 to + 120 • the most of industrial application (low-mid power)

98 Sh A Red Polyurethane from - 30 to + 90 from - 40 to + 120 • high torque – narrow angular misalignment – torsion rigidity

64 Sh D Green Polyurethane from - 30 to + 110 from - 30 to + 130 • dampened areas – internal combustion engines

Spiders for special applications

Admissible Temperature
[°C]
(Shore) Colour Compound Applications
on work peaks

• internal combustion engines / high dynamic solicitations /

94 Sh A-T Orange Polyurethane from - 50 to + 110 from - 60 to + 130
highly dampened areas
• high solicitation applications / high torsion rigidity /
64 Sh D-H Green Hytrel from - 50 to + 110 from - 60 to + 150
high temperature areas
• high torsion rigidity / high temperature areas /
PA White Polyurethane from - 20 to + 110 from - 30 to + 150
high resistance

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TRASCO® coupling sizing as per DIN 740/2

TRASCO® coupling sizing is made according to DIN 740/2. Couplings must be selected to ensure that the max feasible torque is
never exceeded during operation.
It is necessary to have correct sizing, so that all conditions hereunder are respected.

TRASCO 
1) Verify the nominal torque
The nominal torque of the coupling must be higher or equal to the nominal torque of the drive multiplied by the temperature safety
factor.
TKN ≥ TN ⋅ S θ [Nm]
TKN ≥ TN ⋅ SPθ [Nm]
Note that:
TN = 9550 N [Nm]
n
PN
TNT=KN9≥55T0
N ⋅ Sθ [Nm[Nm] ]
TKmax ≥ TS ⋅ Sn θ ⋅ S Z ⋅ Su [Nm]

Where PN is the motor nominal PNin kW.

TKTmax ≥ Tpower [Nm
S ⋅ S θ ⋅ SZ ⋅ S
N = 9550
[Nm]
u ]
TKNT≥ ≥N T
KNT N ⋅θS θ [
⋅S [Nm
nNm ]]
2) Verify the maximum torque
TT ≥ T ≥⋅ must
The max torque of the coupling
KNKmax N
S SN[θbe
TSθ ⋅P Nm ]
⋅ Shigher [Nmequal
Z ⋅ Su or ] to the starting torque Ts multiplied by the safety factors Sθ, Sz, Su where Su
TKTmax
N =≥ TS ⋅ S θ [Nm[]Nm]
9550
is the higher value between driver and n driven units.
TT KN ≥≥TTNS⋅⋅SSθθ [Nm]
Kmax
TTKW axT≥ ⋅T
Km≥ S ⋅ S θ ⋅ S Z ⋅ Su
W S θ [Nm]
[Nm]
TTT
3) Verify torque with reversal≥ T≥ TS ⋅θ S θ[Nm
W⋅S
[Nm
[Nm ]] ]
KN ≥ TN ⋅ S θ
Kmax
KW
∆K aA it∆must
In case of torque with reversals K rA be∆K verified
wA that:
+ + ≤1
∆K a ∆K r ∆K w
T ≥ T ⋅ S [N m
KθθrA [Nm]
+ ] wA ≤ 1
K aA≥ TWS∆⋅ S
T∆KKW ∆K
max +
∆K a ∆K r ∆K w
where Tkw = torque with reversal, which the coupling can bear, and Tw = torque variation of the drive.
T ∆K T ⋅ S∆K[rANm]∆K wA
≥ aA
W + θ vibrations
KWtorsional + ≤ 1piston compressors, combustion engine) it is recommended to make a torsional
In case of drives with high (eg.
∆K a ∆K r ∆K w
vibration calculations in order to guarantee the correct functioning of the coupling. Please consult our technical office.

∆K aA ∆K rA ∆K wA
+ Shock
+ load≤ safety
1 factor Shock load type SU
∆K a ∆K r ∆K w
Light 1,4
Medium 1,5
Hard 1,8

Temperature safety factor T (°C) –30°C / +30°C +40°C +60°C +80°C

Sθ 1 1,2 1,4 1,8

Safety factor for frequency of starting Starting/h

0÷100 101÷200 201÷400 401÷800
SZ 1 1,2 1,4 1,6

Hub shaft connection check

Hub shaft connection must always be checked by the user. It is important to verify the maximum torque in the drive is lower than the
torque which the hub shaft connection can bear. In case of keyway connection, it is important to verify the tensile strength of the hub
material with the load which the keyway seat must transmit.

color Coupling nominal torque Nm

Sθ Temperature factor
TKmax Coupling maximum torque Nm
SZ Start frequency factor
TKW Torque with reversal transmissible by the coupling Nm
Su Motor or driven-side shock factor
TN Motor nominal torque Nm
PN Motor nominal torque kW
TS Motor peak torque Nm
n rpm min-1
TW Torque with reversal of the machine Nm

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Type of stress

Periodic Harmonic

2TW

TW
TN
TN

Misalignment

Type ∆KaP [mm] ∆KaS [mm] ∆Kr [mm] ∆Kw [°]

19/24 1,2 - 0,20 1,30

24/32 1,4 1,1 0,22 1,30
28/38 1,5 1,2 0,25 1,30
38/45 1,8 1,4 0,28 1,30
42/55 2,0 1,6 0,32
TKN ≥ TN ⋅ S θ1,30[Nm]
48/60 2,1 1,7 0,36 1,30
55/70 2,2 1,8 0,38 1,30
65/75 2,6 2,0 0,42 PN
TN = 9550 1,30 [Nm]
75/90 3,0 2,4 0,48 n1,30
90/100 3,4 2,8 0,50 1,30
100/110 3,8 3,0 0,52
TKmax ≥ TS ⋅ S1,30
θ ⋅ S Z ⋅ Su [Nm]
110/125 4,2 3,2 0,55 1,30
125/145 4,6 3,4 0,60 1,30

n=1500 min-1
TKN ≥ TN ⋅ S θ [Nm]

The values shown in the table for radial and angular misalign- TKmax ≥ TS ⋅ S θ [Nm]
ment, must be corrected in case they are simultaneously acting
on the coupling.
The sum of the admissible value (A) and the respective values TKW ≥ TW ⋅ S θ [Nm]
shown in the table must be lower or equal to 1.

∆K aA ∆K rA ∆K wA
∆Kw + + ≤1
∆K a ∆K r ∆K w
100%

∆KaP Maximum axial misalignment - ”P” execution mm

∆KaS Maximum axial misalignment - ”S” execution mm
∆Kr Maximum radial misalignment mm
∆Kw Maximum angular misalignment °

100% ∆Kr

Dynamic torsional rigidity

Dynamic torsional rigidity CTdin is the first derivate of the nominal
torque of half coupling in respect to the torsion angle. ϕ is the tor-
TKN sion angle of half coupling in respect to the second half.
As a general rule, CTdin is greater than CT and depends on the
stress acting on the coupling.
dTKN

ϕ
dϕ

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Technical performances
The technical performances below refer to all types of TRASCO® For particular applications needed, such as very high chemical
executions and are valid for the indicated spiders when couplings resistance, spiders made of special material are available.
are correctly selected. Contact our Technical Department.

TRASCO 
Spider - 92 Sh A - YELLOW
Type
Technical features
19/24 24/32 28/38 38/45 42/55 48/60 55/70 65/75 75/90 90/100 100* 110* 125*
TKN [Nm] 10 35 95 190 265 310 410 625 1280 2400 3300 4800 6650
Torque TKmax [Nm] 20 70 190 380 530 620 820 1250 2560 4800 6600 9600 13300
TKW [Nm] 2,7 9 25 49 69 81 107 163 333 624 858 1248 1729
n (v=30m/s) [min-1] 14000 10600 8500 7100 6000 5600 4750 4250 3550 2800 2500 2240 2000
Max. speed
n (v=40m/s) [min-1] 19000 14000 11800 9500 8000 7100 6300 5600 4750 3750 3350 3000 2650
CTdin (1 TKN) [Nm/rad] 1280 4860 10900 21050 23740 36700 50720 97130 113320 190090 253080 311610 474960

Dynamic torsional CTdin (0,75 TKN) [Nm/rad] 1050 3980 8940 17260 19470 30090 41590 79650 92920 155870 207530 255520 389390
rigidity CTdin (0,5 TKN) [Nm/rad] 800 3010 6760 13050 14720 22750 31450 60220 70260 117860 156910 193200 294410
CTdin (0,25 TKN) [Nm/rad] 470 1790 4010 7740 8730 13490 18640 35700 41650 69860 93010 114520 174510
ϕ (TKN) (°) 3,2°
Torsion angle
ϕ (TKmax) (°) 5°
Dampening factor Ψ (-) 0,80
Resonance factor VR (-) 7,90

*= 95 Sh A

Spider - 98 Sh A - RED
Type
Technical features
19/24 24/32 28/38 38/45 42/55 48/60 55/70 65/75 75/90 90/100
TKN [Nm] 17 60 160 325 450 525 680 950 1950 3600
Torque TKmax [Nm] 34 120 320 650 900 1050 1250 1900 3900 7200
TKW [Nm] 4,4 16 42 85 117 137 178 245 500 936
n (v=30m/s) [min-1] 14000 10600 8500 7100 6000 5600 4750 4250 3550 2800
Max. speed
n (v=40m/s) [min-1] 19000 14000 11800 9500 8000 7100 6300 5600 4750 3750
CTdin (1 TKN) [Nm/rad] 2920 9930 26770 48570 54500 65290 94970 129510 197500 312200

Dynamic torsional CTdin (0,75 TKN) [Nm/rad] 2390 8140 21950 39830 44690 53540 77880 106200 161950 256000
rigidity CTdin (0,5 TKN) [Nm/rad] 1810 6160 16600 30110 33790 40480 58880 80300 122450 193560
CTdin (0,25 TKN) [Nm/rad] 1070 3650 9840 17850 20030 24000 34900 47600 72580 114730
ϕ (TKN) (°) 3,2°
Torsion angle
ϕ (TKmax) (°) 5°
Dampening factor Ψ (-) 0,80
Resonance factor VR (-) 7,90

Spider - 64 Sh D - GREEN
Type
Technical features
19/24 24/32 28/38 38/45 42/55 48/60 55/70 65/75 75/90 90/100
TKN [Nm] 21 75 200 405 560 655 825 1175 2410 4500
Torque TKmax [Nm] 42 150 400 810 1120 1310 1650 2350 4820 9000
TKW [Nm] 5,5 19,5 52 105 145 170 215 305 625 1170
n (v=30m/s) [min-1] 14000 10600 8500 7100 6000 5600 4750 4250 3550 2800
Max. speed
n (v=40m/s) [min-1] 19000 14000 11800 9500 8000 7100 6300 5600 4750 3750
CTdin (1 TKN) [Nm/rad] 5350 15110 27520 70150 79860 95510 107920 151090 248220 674520

Dynamic torsional CTdin (0,75 TKN) [Nm/rad] 4390 12390 22570 57520 65490 78320 88500 123900 203540 553110
rigidity CTdin (0,5 TKN) [Nm/rad] 3320 9370 17060 43490 49520 59220 66910 93680 153900 418200
CTdin (0,25 TKN) [Nm/rad] 1970 5550 10120 25780 29350 35100 39660 55530 91220 247890
ϕ (TKN) (°) 2,5°
Torsion angle
ϕ (TKmax) (°) 3,6°
Dampening factor Ψ (-) 0,75
Resonance factor VR (-) 8,50

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TRASCO® couplings for motors according to IEC standards

(spider hardness 92 shore)

3000 1500 1000 750 dxl

[1/min] [1/min] [1/min] [1/min] [mm]
Type
PN TN PN TN PN TN PN TN 2 4-6-8
[kW] [Nm]
Type K [kW] [Nm]
Type K [kW] [Nm]
Type K [kW] [Nm]
Type K
poles poles

0,75 2,5 9,2 0,55 3,7 6,2 0,37 3,9 5,8 0,18 2,5 9,2
80 19x40
1,1 3,7 6,2 0,75 5,1 4,5 0,55 5,8 19/24 3,9 0,25 3,5 6,5
19/24 19/24 19/24
90 S 1,5 5 4,6 1,1 7,5 3 0,75 8 2,8 0,37 5,3 4,3
24x50
90 L 2,2 7,4 3,1 1,5 10 2,3 1,1 12 6,6 0,55 7,9 2,9
9,8 2,2 15 5,3 0,75 11 7,2
100 L 3 8,1 1,5 15 24/32 5,3
24/32 3 20 24/32 4 1,1 16 24/32 5 28x60
112 M 4 13 6,1 4 27 2,9 2,2 22 3,6 1,5 21 3,8
5,5 18 12,7
132 S 5,5 36 6,3 3 30 7,6 2,2 30 7,6
7,5 25 9,2
28/38 28/38 28/38 28/38 38x80
4 40 5,7
132 M 7,5 49 4,6 3 40 5,7
5,5 55 4,1
11 36 12,5 4 54 8,3
160 M 11 72 6,2 7,5 74 6
15 49 38/45 9,1 38/45 38/45 5,5 74 38/45 6 42x110
160 L 18,5 60 7,5 15 98 4,5 11 108 4,1 7,5 100 4,5
180 M 22 71 8,7 18,5 121 5,1
48x110
180 L 22 144 4,3 15 148 4,1 11 145 4,2
42/55 42/55 42/55
30 97 6,3 18,5 181 3,4
200 L 42/55 30 196 3,1 15 198 3,1 55x110
37 120 5,1 22 215 2,8
225 S 37 240 3 18,5 244 2,9
48/60 48/60 48/60 55x110 60x140
225 M 45 145 4,2 45 292 2,4 30 293 2,4 22 290 2,4
250 M 55 177 48/60 4 55 356 55/70 2,4 37 361 55/70 2,3 30 392 65 2,6 60x140 65x140
280 S 75 241 3,5 75 484 5,1 45 438 5,7 37 483 5,1
75/90 75 75 75x140
280 M 90 289 55/70 2,9 90 581 4,3 55 535 4,6 45 587 4,2
315 S 110 353 2,4 110 707 3,5 75 727 75/90 3,4 55 712 3,5
75/90 75/90 65x140
315 M 132 423 5,9 132 849 2,9 90 873 2,8 75 971 6,2
80x170
160 513 4,8 160 1030 5,9 110 1070 5,7 90 1170 5,2
315 L 75/90 90/100 90 90
200 641 3,9 200 1290 4,7 132 1280 4,7 110 1420 4,2
250 801 3,1 160 1550 3,9 132 1710 90/100 3,5
250 1610 3,7 90/100
355 L 90/100 200 1930 3,1 160 2070 2,9 75x140 95x170
100
315 1010 6 315 2020 3 250 2420 100 2,5 200 2580 2,3
90/100
355 1140 5,3 355 2280 2,6
400 L 100 315 3040 100 2 250 3220 100 1,8 80x170 110x210
400 1280 4,7 400 2560 2,3

PN Motor nominal torque kW

TN Motor nominal torque Nm
K Safety factor
dxl Motor shaft’s end mm

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GRMP...B
“GR” base program
TRASCO® couplings are dimensionally manufactured to hub available in both “A” and “B” executions.
types “A” and “B”, the difference being the maximum shaft Materials used for manufacture are:
diameter which hubs can accept (corresponding respectively to • cast iron grade GG25 (all sizes);

TRASCO 
the first and second code number). • aluminum, diecasting
The long hub execution “L” (allows full cover of the motor shaft) is • cast iron grade GGG40 and steel upon request.

H M H

S N S GRMP...A
I I
t AR
P

GRMP...B
G
E

B
A

Fb
Fa

Fg
Fg

M o zzo M o zzo
"A " "B"

Dimensional specification hubs in GG25 H M H

120107/ 1/ C L
Fa Fb Fg [mm] E A B A B execution S
AL execution N S BL execution M S N G
execution
Type max max I I
[mm] [mm] A B [mm] [mm] [mm] H [mm] L [mm] I [mm] H [mm] L [mm] I [mm] H [mm] L [mm] I [mm] H [mm] L [mm] I [mm] [mm] [mm] [mm] [mm]
t
19/24* - 24 - - 40 - 40 25 66 - 25 66 - - P - - 50 - - 16 2 12 18
24/32 24 32 8 10 55 40 55 30 78 24 30 78 - 50 128 44 60 128 - 18 2 14 27
28/38 28 38 8 10 65 48 65 35 90 28 35 90 - 60 160 53 80 160 - 20 2,5 15 30
38/45 38 45 10 12 80 66 80 45 114 37 45 114 - 80 214 72 110 214 - 24 3 18 38
42/55 42 55 10 12 95 75 95 50 126 40 50 126 - 110 246 100 110 246 - 26 3 20 46
G

48/60 48 60 12 12 105 85 105 56 140 45 56 140 - 110 278 99 140 278 - 28 3,5 21 51
E

B
A

Fb
55/70 55 70 15 15 120 98 120 65 160 52 65 160 - 110 280 97 140 280 - 30 4 22 60
Fa

65/75 65 75 15 15 135 115 135 75 185 61 75 185 - 140 315 126 140 315 - 35 4,5 26 68

Fg
Fg

75/90 75 90 15 15 160 135 160 85 210 69 85 210 - 140 350 124 170 -
M o zzo M350
o zzo 40 5 30 80
90/100 90 100 20 20 200 160 180 100 245 81 100 245 81 "A " 425
170 151 210 "B"
425 191 45 5,5 34 100
100/110 115 - 45 - 225 180 - 110 270 89 110 270 - - - - - - - 50 6 38 113
110/125 125 - 55 - 255 200 - 120 295 96 120 295 - - - - - - - 55 6,5 42 127
125/145 145 - 55 - 290 230 - 140 340 112 140 340 - - - L
- - - - 60 7 46 147

* Sintered steel Valid bore for “P” execution

Dimensional specification hubs in aluminum

Fa Fb Fg [mm]
execution E A B L H M120107/S1/ C L N I G
Type max max
[mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm]
[mm] [mm] A B
19/24 - 24 - 4 40 40 40 66 25 16 2 12 - 18

24/32 24 32 6 22 55 40 55 78 30 18 2 14 24 27

28/38 28 38 8 26 65 48 65 90 35 20 2,5 15 28 30

38/45 38 45 10 36 80 66 77 114 45 24 3 18 37 38

42/55 - 55 - 15 95 - 95 126 50 26 3 20 - 46

48/60 - 60 - 24 105 - 105 140 56 28 3,5 21 - 51

Order form
TRASCO GR hub
“P” precise execution; “S” standard execution
Tipo
“A” Execution ; Execution “B”
Long hub
GRM P 42/55 A L

TRASCO GR aluminum hub TRASCO GR spider

Type Type
Execution “A” ; Execution “B” Yellow colour if not indicated,
GRMALU 38/45 A AR 19/24 R “R” red, “V” green

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Stock range
Hubs with finished bore H7, keyway, stop screw

Type 19/24 24/32 28/38 38/45 42/55 48/60 55/70 65/75 75/90 90/100

Material* ALU AC ALU GG ALU GG ALU GG ALU GG ALU GG GG GG GG GG

Hub
execution B B A B A B A B A B A B A B B A B B A B A B A A A

10 • •
11 • •
12 • •
14 • • • • • •
15 • • • • • •
16 • • • • • •
18 • • • • •
19 • • • • • •
20 • • • • • •
22 • • • • •
24 • • • • • • • • • •
25 • • • • • • • •
Stock range bore [mm]

28 • • • • • • • •
30 • • • • • • • •
32 • • • • • • • •
35 • • • • • • • • •
38 • • • • • • • • •
40 • • • • • • • •
42 • • • • • • •
45 • • • • • • •
48 • • • • • • •
50 • • • • • • • •
55 • • • • • • • •
60 • • • • • •
65 • • • •
70 • • •
75 • •
80 •
85 •
90 •
*ALU = Aluminum - AC = Steel - GG = Cast iron

Setscew specifics per hub dimension

Hub dimension P [mm] t [mm]
t
19 M5 10 P
24/32 M5 10
GRMP....A
28/38 M6 15
38/45 M8 15
42/55 M8 20
48/60 M8 20
55/70 M10 20
65/75 M10 20
75/90 M10 25
90/100 M12 30
100/100 M12 30
110/125 M16 35
125/145 M16 40

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“GRB” taper bush series

TRASCO® couplings type GRB are manufactured in cast iron B1 and B2 (see picture);

Ø E
Ø B

Ø B
Ø d

Ø d
GG25. They combine the typical high performances of standard
couplings with the mounting and dismounting advantages offe- • they solve the problem of fighting corrosion;

TRASCO 
red by the SER-SIT® taper bush: • hubs type B1 may be axially moved for spider replacement;
- they are ready to be mounted; • they may be used in all types of machinery.
- they are manufactured in two different executions:
I I
B2
L
H M H
H M H
B1 S N S
S N S

Ø E
Ø B

Ø B
Ø d

Ø d
Ø E
Ø B

Ø B
Ø d

Ø d

I I I I
B1 B2
L L

H M H
B1
S N S
E B L H M S N I
Type Taper bush
[mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm]
28/38 1108 (2820) 65 65 66 23 20 2,5 15 -
38/45 1108 (2820) 80 78 70 23 24 3 18 15
Ø E
Ø B

Ø B
42/55 1610 (4025) 95 94 78 26 26 3 20 16
Ø d

Ø d
48/60 1615 (4040) 105 104 106 39 28 3,5 21 28
55/70 2012 (5030) 120 118 96 33 30 4 22 20
Ø B
Ø d

65/75 2012 (5030) 135 133 101 33 35 4,5 26 19

75/90 2517 (6545) 160 158 130 45 40 5 30 36
I I
90/100 * 3535 (9090) 200 180 223 89 45 5,5 34 70
L

* Only “B1” execution B2

H M H
S N S
Ø E
Ø B

Ø B
Ø d

Ø d
Ø B
Ø d

I I
L

H M H
B1
S N S

Order form
Ø E
Ø B

Ø B
Ø d

Ø d

TRASCO GRMB hub for taper lock Transmissible

Type Taper lock torque
type [Nm]
“B1” Execution ; “B2” Execution
GRMB 42/55 B1 1108 (2820) 150
I I
L 1610 (4025) 490
1615 (4040) 490
Spider
2012 (5030) 800
Type
2517 (6545) 1300
Yellow if not indicated, “R” red, “V” green
AR 19/24 R 3535 (9090) 5000

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Ø E
Ø B
“GRCAL” series for use with SIT-LOCK® elements type 8
This execution has been introduced to incorporate advantages washers, spacers and stop rings.
offered by the SIT-LOCK® locking elements in "GRCAL"
the shaft-hub
ESECUZIONE 1 cal. esterno Many different solutions may be created L1 to solve all kinds of
connection. application needs. L2
The system allows for a quick, safe and backlash free mounting We include hereunder a very useful example.In fact, the same hub
without the use of keyway and eliminating the need for lock bore allows the fitting of different shaft diameters.

H M H H M H
H M H
I S N S I I S N S I "GRCAL"
Esecuzione
I S2 N S I
Ø E
ØB

Ø E
Ø B

ØE
ØB
"GRCAL"
ESECUZIONE 1 cal. interno

L1
L1 L1 L2
L2 L2

FIG 1 FIG 2 FIG 3

"GRCAL"
Esecuzione 3

H
d D H M E H B L1 L2 M S N I
Type I S N[mm]
S [mm]
I
Material* Fig.
[mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm]

38/45 14 -16 -18 -19 - 20 - 22 - 24 - 25 - 28 - 30 55 30 80 78 84 116 24 3 18 22 AC 3

14 - 16 - 18 - 19 - 20 - 22 - 24 - 25 - 28 - 30 55 22 70 102 14 GS-400 2
42/55 95 93 26 3 20
ØE
ØB

24 - 25 - 28 - 30 - 32 - 35 - 38 - 40 65 32 90 122 22 AC 3
14 - 16 - 18 - 19 - 20 - 22 - 24 - 25 - 28 - 30 55 38 104 136 27 GS-400 1
48/60 105 103 28 3,5 21
24 - 25 - 28 - 30 - 32 - 35 - 38 - 40 65 33 94 126 22 AC 3
14 -16 -18 -19 - 20 - 22 - 24 - 25 - 28 - 30 55 38 106 138 25 GG25 1
L1
55/70 24 - 25 - 28 - 30 - 32 - 35 - 38 - 40 65 38 120 118 106 138 30 4 22 25 GS-400 1
L2
30 - 32 - 35 - 38 - 40 - 42 - 45 - 48 - 50 80 38 106 138 25 AC 3
14 - 16 - 18 - 19 - 20 - 22 - 24 - 25 - 28 - 30 55 38 111 143 24 GG25 1
65/75 24 - 25 - 28 - 30 - 32 - 35 - 38 - 40 65 38 135 133 111 143 35 4,5 26 24 GS-400 1
30 - 32 - 35 - 38 - 40 - 42 - 45 - 48 - 50 80 25 85 117 11 GS-400 2
14 - 16 - 18 - 19 - 20 - 22 - 24 - 25 - 28 - 30 55 38 116 148 22 GG25 1
75/90 24 - 25 - 28 - 30 - 32 - 35 - 38 - 40 65 38 160 158 116 148 40 5 30 22 GG25 1
30 - 32 - 35 - 38 - 40 - 42 - 45 - 48 - 50 80 41 122 154 25 GS-400 1
14 - 16 - 18 - 19 - 20 - 22 - 24 - 25 - 28 - 30 55 38 121 153 19 GG25 1
90/100 24 - 25 - 28 - 30 - 32 - 35 - 38 - 40 65 38 200 180 121 153 45 5,5 34 19 GG25 1
30 - 32 - 35 - 38 - 40 - 42 - 45 - 48 - 50 80 41 127 159 22 GG25 1

*: AC = steel / GG 25 = cast iron 25 / GS-400 = Spheroidal cast-iron 400

Order form

TRASCO GRMC hub for SIT-LOCK type 8

Type
GRMC 48/60
Fig. 1
Spider External Cal Fig. 2
Type
Yellow if not indicated, “R” red, “V” green
AR 38/45 R

SIT-LOCK element
Type
Bore diameter
Fig. 1
External bore diameter Fig. 3
Internal Cal
CAL 8 F20 / 55

Direct drives (073.00)

10
 AR www.sitspa.com

“GRL” series with intermediate shaft

This series allows the joining of two shafts (even very distant) capability and large radial misalignments.
through two TRASCO® couplings and an intermediate shaft Hubs are classically made from cast-iron, while shafts are from
(length “Lw”) of customized dimension. steel; though, different materials can be used, according to

TRASCO 
The presence of two polyurethane rings allows high dampening different applications.

Lzw
H Lw H
I

M o zzo M o zzo
A B

B
Fb
Fa
E

G
S N S
I I
H M H
L

H [mm] L I [mm]
execution 180107/ 3/[mm]
CL execution
Fa Fb E A B M S N G
Type
[mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm]
A-B AL BL A-B AL-BL A B AL BL

24/32 9 - 24 11 - 32 55 40 55 30 50 60 78 128 18 2 14 24 - 44 - 27
28/38 9 - 28 11 - 38 65 48 65 35 60 80 90 160 20 2,5 15 28 - 53 - 30
38/45 11 - 38 13 - 45 80 66 80 45 80 110 114 214 24 3 18 37 - 72 - 38
42/55 11 - 42 13 - 55 95 75 95 50 110 110 126 246 26 3 20 40 - 100 - 46
48/60 13 - 48 13 - 60 105 85 105 56 110 140 140 278 28 3,5 21 45 - 99 - 51
55/70 16 - 55 16 - 70 120 98 120 65 110 140 160 280 30 4 22 52 - 97 - 60
65/75 16 - 65 16 -75 135 115 135 75 140 140 185 315 35 4,5 26 61 - 126 - 68
75/90 16 - 75 16 - 90 160 135 160 85 140 170 210 350 40 5 30 69 - 124 - 80
90/100 21 - 90 21 - 100 200 160 180 100 170 210 245 425 45 5,5 34 81 81 151 191 100
100/110 46 - 115 - 225 180 - 110 - - 270 - 50 6 38 89 - - - 113
110/125 56 - 125 - 255 200 - 120 - - 295 - 55 6,5 42 96 - - - 127
125/145 56 - 145 - 290 230 - 140 - - 340 - 60 7 46 112 - - - 147

valid bore for “P” execution

Order form GRMP...A

GRMP...A
TRASCO GR hub
“P” Precise execution; “S” standard execution
Type
ALLUNGA
“A” Execution ; “B” Execution GRMP...B
Long hub
GRM P 42/55 A L

AR
Spider
Type
Yellow if not indicated, “R” red, “V” green
AR 38/45 R

Shaft length on request.

Lzw
H Lw H
Direct drives (073.00)
I 11
 www.sitspa.com

“GRL CAL3” series with intermediate shaft

This series allows the joining of two shafts (even two spaced) dampening capability and large radial misalignments.
through two TRASCO® couplings and an intermediate shaft Hubs are classically made of cast-iron, while shafts are made
(length “LR2”) of customized dimension, fixed with hubs throu- of steel; though different materials can be used according to
gh shrink-disc. different applications.
The presence of two polyurethane elements allows high

L L2
L1 E L3
S N S
Ø DH

Ød

Ø dR

LR2
LZR2

Dimensions [mm] GRL-CAL3 Internal hub

External hub
SITLOCK 3 elements
LR2L L2
Type Intermediate shaft
DH L1 L3 L E N s L2 LZR2 Screw
TA
dmin dmax L1 min.E L3 Type Din 912-12.9
dR C [Nm/Rad·m] [Nm]
S N S M·L
14 4 15 30 11 26 50 13 10 1,5 61,5 109 LR2+22 10x2.0 68,36 10x16 M4X10 4,9

19/24 6 24 40 25 26 67 16 12 2 81 120 LR2+50 12x2.0 130 12x18 M4X10 4,9

24/32 8 28 55 30 38 86 18 14 2 102 156 LR2+60 20x3.0 954,9 20x28 M6X18 17

28/38 10 38 65 35 45 100 20 15 2,5 117,5 177 LR2+70 25x2.5 1811 25x34 M6X18 17
Ø DH

Ød

Ø dR

38/45 12 45 80 45 45 114 24 18 3 135 192 LR2+90 32x3.5 5167 32x43 M6X18 17

42/55 14 55 95 50 52 128 26 20 3 151 214 LR2+100 40x4.0 11870 40x53 M6X18 17

48/60 15 60 105 56 70 154 28 21 3,5 178,5 261 LR2+112 45x4.0 17486 45x59 M8X22 41
LR2
5570 20 74 120 65 80 175 30 22 4 28201
0207/288
2/ C LLR2+130 55x4.0 LZR2
33543 55x71 M8X22 41

65/75 22 80 135 75 80 190 35 26 4,5 220,5 307 LR2+150 60x4.0 44362 60x77 M8X22 41

Order form

TRASCO GR hub
Type
GRM 48/60 per cal 3

Spider
Type
Yellow if not indicated, “R” red, “V” green
AR 38/45 R

Intermediate shaft on request

Direct drives (073.00)

12
280207/ 2/ C L
 www.sitspa.com

Fa

Ea
E

Fa
A

A
G
“GRF” flange series Bb

This series, with flanges, has been developed for applications on the elastic element without traversing of either motor-machine or
heavy machinery and to combine different shafts and flanges driven-machine.
solutions. • Shaft-flange: using one hub type “CF” and one type “GR”.

TRASCO 
• Shaft-shaft: using two hubs type “BF”, allows the replacement of • Flange-Flange: using two N Stype “CF”.
S hubs I
H M V H

Lb Lc
BF CF

Nr
Ea
Fa

C
G
A
Ea
E

D
Fa
A

A
G

Fa
Bb Bc

P
GRMP...A AR
BF
S S N S
S N I
H M V
H M V H

BF CF

Lc
CF

Fa Fa
Nr

min max E Ea A C D Nr P G H Bb Bc I V M S N Lb Lc
Type
[mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm]
CF
[mm] [mm]
Ea
E

C
G
A

D
Fa

19/24 - 19 40 65 40/32 40 50 5 4,5 18 25 26 1,5 17 8 16 2 12 74 49

Bc
24/32 9 24 55 80 55/40 55 65 5 4,5 27 30 31 1,5 22 8 18 2 14 86 56
P

28/38 9 28 65 100 65/48 65 80 6 6,5 30 35 36 1,5 25 10 20 2,5 15 100 65

38/45 11 38 80 115 66 80 95 6 6,5 38 45 46 1,5 35 10 24 3 18 124 79
42/55 11 42 95 140 75 95 115 6 9 46 50 51 2 38 12 26 3 20 138 88
S N S
48/60 13 48 105 H 150 M 85
V 105 125 8 9 51 56 57 2 44 12 28 3,5 21 152 96
55/70 16 55 120 175 98 120 145 8 11 60 65 66 2 49 16 30 4 22 176 111
65/75 16 65 135 190 115 135 160 10 11 68 75 76 2 59 16 35 4,5 26 201 126
75/90 16 75 160 215 135 160 185 10 14 80 85 87 2,5 66 19 40 5 30 229 144
Lb 230107/ 1/ C L
90/100 21 90 200 260 160 200 225 12 14 B100
F 100 102 3 80 20 45 5,5 34 265 165
100/110 46 115 225 285 180 225 250 12 14 113 110 112 4 85 25 50 6 38 295 185
110/125 56 125 255 330 200 255 290 12 18 127 120 122 4 94 26 55 6,5 42 321 201
125/145 56 145 290 370 230 290 325 16 18 147 140 142 5 110 30 60 7 46 370 230
Fa

Ea
E

Fa
A

A
G

Bb
Valid bore for “P” execution.

GRMP...A AR
Order form BF
S N S I
Shaft side flange H“BF” M V H
execution
BF
Type
GRFBF 48

Lc
CF
For hub “GR” order form please see TRASCO® GR base program
Nr

Ring side flange “BF” and “CF” execution

CF
Type CF
Ea
E

C
G
A

D
Fa

GRFCF 48 Bc
P

Nr Number of screws S N S
H M V

Direct drives (073.00)

13
230107/ 1/ C L
 G
Bc

D
www.sitspa.com

P
“GRF C” flange Sseries
N S
H M V

The GRF C series has the same characteristics as the BF series, while being compact in dimension.

Lb
Lc
BFN
C FN

Nr

Nr
Fa
E

E
B
A

Fa

C
Fa
E

E
G

A
D
Bb

G
Bc

D
P
S N S I
P
S N S
H M V H H M V

BFN CFN

Lb

BFN
240107/ 2/ C L

Nr
Fa
E

E
B
A

Fa
G

D
DBb
Fa Fa
E A B H I Lb Lc V M S N Bb Bc G C P
Type min max [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] Nr [mm] [mm]
[mm] [mm]

24/32 9 24 55 40 36 30 22 86 56 8 18 2 14 31 1,5 27 45 8 36 M5

28/38 9 28 65 48 42 35 25 100 65 10 20 2,5 15 36 S 1,5N S

30 54 I 8 44 M6

P
38/45 11 38 80 66 52 45 35 124 79 10 24 3 18 H 46 M
1,5 V
38 66H 8 54 M8

42/55 11 42 95 75 62 50 38 138 88 12 26 3 20 51 2 46 80 12 65 M8

48/60 13 48 105 85 70 56 44 152 96 12 28 3,5 21 57 2 51 90 12 75 M8

55/70 16 55 120 98 80 65 49 176 111 16 30 4 22 66 2 60 102 8 84 M10

65/75 16 65 135 115 94 75 59 201 126 16 35 4,5 26 76 2 68 116 12 96 M10

75/90 16 75 160 135 108 85 66 229 144 19 40 5 30 87 2,5 80 136 15 112 M12

90/100 21 90 200 160 142 100 80 265 165 20 45 5,5 34 102 3 100 172 15 145 M16

100/110 46 115 225 180 158 110 85 295 185 25 50 6 38 112 4 113 195 15 165 M16

110/125 56 125 255 200 178 120 94 321 201 26 55 6,5 42 122 4 127 218 15 180 M20

125/145 56 145 290 230 206 140 110 370 230 30 60 7 46 142 5 147 252 15 215 M20

Valid bore for “P” execution.

GRMP...A
AR
Order form BFN
CFN

BFN MFN
Shaft side flange “BFN” execution
Type
GRFBFN 48

For hub “GR” order form please see TRASCO® GR base program

Ring side flange “BFN” and “CFN” execution CFN

Type CFN
Lc
GRFCFN 48
C FN
Nr

Nr Number of screws
C
Fa
E

E
A

Bc
D
P

S N S
H M V
Direct drives (073.00)
14
 www.sitspa.com

“GRS” double cardanic series

It allows compensation of high axial, radial and angular misalign- double the torsion angle and provides very high dampening
ment. Moreover, the use of the double spider allows for effect.

TRASCO 
L
Ø Fa
Ø E

Ø B
Ø Fb
Ø A

Ø G

S N S S N S
I M V M I
H C H

Fa Fb H V C M S N L E L A B G ∆Kr ∆Kw
Type
[mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [°]
GRMP...A
24/32 9 - 24 11 - 32 30 16 52 18 2 14 112 AR 55 40 55 27 0,89
28/38 9 - 28 11 - 38 35 18 58 20 2,5 15 128 65 48 65 30 1
GRS
38/45 11 - 38 13 - 45 45 20 68 24 3 18 158 80 66 80 38 1,15
Ø Fa
Ø E

Ø B
Ø Fb
Ø A

Ø G

42/55 11 - 42 13 - 55 50 22 74 26 3 20 174 95 75 95 46 1,26

AR
48/60 13 - 48 13 - 60 56 24 80 28 3,5 21 192 105 85 105 51 1,36 1°30’
55/70 16 - 55 16 - 70 65 28 88 30 4 22 218 120 98 120 GRMP...B 1,52
60
65/75 16 - 65 16 - 75 75 32 102 35 4,5 26 252 135 115 135 68 1,75
S N S S N S
75/90 16 - 75 16 - 90 85 36 116 40 5 30 I 286 M160 V 135
M 160I 80 2
90/100 21 - 90 21 - 100 100 40 130 45 5,5 34 H330 200 C 160 180
H 100 2,5

Valid bore for “P” execution

GRMP...A
AR

GRS

Order form GRS AR

For hub “GR” order form please see TRASCO® GR base program GRMP...B

Spacer element
Type
GRS 48/60

Fa Bore of hub “A” mm

Fb Bore of hub “B” mm
∆Kr Maximum radial misalignment mm
∆Kw Maximum angular misalignment °

Direct drives (073.00)

15
 www.sitspa.com

“GR FRT” drum brake series

This series has been developed to suit drum-brake (FRT) cast-iron (GS400), or steel according to application.
transmissions. Also, assembling of different dimensioned brake bands to any
It is constituted as an elastic coupling screwed to the brake band. kind of coupling is allowed. See below tables.
Components are either made of cast-iron (G25), spheroidal

FRT
FRT

Ct

G
V

B j6
D Nr
Fb

Db
Fa
E
A

P
S N S
H M H

Bb
L

GR FRT - drum brake min-1

WFRT JFRT
with
Db x Bb Vmax
28 38 42 48 55 65 75 90 100 110 125 [kg] [kg m2] 30 m/s

160x60 30 31 - - - - - - - - - 2,12 0,01 3580

FRD
200x75 35 36 38 39 41 - Cd - - - - - 3,45 0,03 2860
250x95 43 44 46 47 49 50 52 - - - - 6,87 0,08 2290
315x118 - - 55 56 58 59 61 64 - - - 14,95 0,28 1820
D Nr
B j6
Fa

Fb
G
E
A

400x150 - - 68 69 71 72 74 77 79 82 - 31,20 0,89 1430

Da

500x190 - - - - - 87 89 92 94 97 101 60,00 2,70 1150

630x236 - - - - - - 107 110 112 115 119 112,00 8,01 910
P

710x265 - - - - - - S N -S - 123 126 130 161,00 14,90 810

800x300 - - - - - - V - - - - 144 202,00 27,20 720
H M H

Fa;Fb FRD
Fa;Fb max [mm] E A BBa H L G
Nr
V M S N D P
Type min
[mm] Fa Fb Fb Fb [mm] [mm] L
[mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm]
(GG25) (GS400) (Steel)
28 FR 10 28 20 22 24 65 48 38 35 90 30 8 6,5 20 2,5 15 52 M6
38 FR 12 38 28 32 34 80 66 50 45 114 38 8 7,5 24 3 18 66 M8
42 FR 14 42 30 38 42 95 75 60 50 126 46 12 9,5 26 3 20 80 M8
48 FR 15 48 35 45 48 105 85 68 56 140 51 12 10,5 28 3,5 21 90 M8
55 FR 20 55 42 50 55 120 98 78 65 160 60 8 12,5 30 4 22 102 M10
65 FR 22 65 48 55 65 135 115 92 75 185
0102012
68
7/ 3/ C13,5
L 35 4,5 26 116 M10
75 FR 30 75 58 70 75 160 135 106 85 210 80 15 15,5 40 5 30 136 M12
90 FR 40 90 75 90 100 200 160 140 100 245 100 15 18,5 45 5,5 34 172 M16
100 FR 45 115 - 100 - 225 180 156 110 270 113 15 20,5 50 6 38 195 M16
110 FR 55 125 - 110 - 255 200 176 120 295 127 15 23,5 55 6,5 42 218 M20
125 FR 55 145 - 130 - 290 230 204 140 340 147 15 27,5 60 7 46 252 M20

FOrder
RT form
For hub “GR” order form please see TRASCO® GR base program
GRFRT FRT

Brake side hub

Ct
Type
G

V
B j6
D Nr
Fb

GRFR 48
Db
Fa
E
A

Band on request.
P

WFRT “GRFRT” weight kg

JFRT “GRFRT” moment of inertia
S N S kgm2
Nr Number of screws H M H

Direct drives (073.00)

16
Bb
 P
S N S
www.sitspa.com
H M H

“GR FRD” brake disc series

Bb
L
This series has been developed to suit disc-brake (FRD) cast-iron (GS400), or steel according to application.
transmissions according to DIN 15431/15435. Also, assembling of different dimensioned brake bands to any kind
It is constituted as an elastic coupling screwed to the brake band. of coupling is allowed. See below tables.

TRASCO 
Components are either made of cast-iron (G25), spheroidal

FRD
Cd

D Nr
B j6
Fa

Fb
G
E
A

Da
P
S N S
V
H M H

FRD
Ba
L

GR FRD - brake disc WFRD JFRD min-1

with
Vmax
Da x Ba 28 38 42 48 55 65 75 90 100 110 125 40 m/s
010207/ 3/ C L [kg] [kg m2]
200x12,5 X X - - - - - - - - - 2,93 0,0154 3820
250x12,5 X X X X - - - - - - - 4,66 0,0376 3060
FRT 315x16 - - X X X X X - - - - 8,62 0,1118 2430
400x16 - - - X X X X X X X - FRT
15,23 0,3152 1910
500x16 - - - - X X X X X X X 23,96 0,7680 1530
630x20 - - - - - X X X X X X 47,72 2,4264 1210
710x20 - - -
Ct - - X X X X X X 60,93 3,9151 1080
G

-V
B j6
D Nr

800x25 - - - - - - X X X X 94,91 7,8790 950

Fb

Db
Fa
E
A

900x25 - - - - - - - - - X X 118,95 12,6091 850

Fa;Fb max [mm]

Fa;Fb E A B H L G Nr V M S N D Cd P
Type min
P

Fa Fb Fb Fb
[mm] S N (GS400)
(GG25) S (Steel)
[mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm] [mm]

28 FR 10 28 H20 M 22 H 24 65 48 38 35 90 30 8 6,5 20 2,5 15 52 28,5 M6

38 FR 12 38 28 32 34 80 66 50 45 114 38 8 7,5 24 3 18 66 37,5 M8
42 FR 14 42 30 38 42 95 75 60 50 126 46 12 9,5 26 3 20 80 40,5 M8
48 FR 15 48 35 45 48 105 85 68 56 140 51 12 10,5 28 3,5 21 90 45,5 M8
Bb
55 FR 20 55 42 50 55 120 98 78 65 160 60 8 12,5 30 4 22 102 52,5 M10
65 FR 22 65 48
L 55 65 135 115 92 75 185 68 12 13,5 35 4,5 26 116 61,5 M10
75 FR 30 75 58 70 75 160 135 106 85 210 80 15 15,5 40 5 30 136 69,5 M12
90 FR 40 90 75 90 100 200 160 140 100 245 100 15 18,5 45 5,5 34 172 81,5 M16
100 FR 45 115 - 100 - 225 180 156 110 270 113 15 20,5 50 6 38 195 89,5 M16
110 FR 55 125 - 110 - 255 200 176 120 295 127 15 23,5 55 6,5 42 218 96,5 M20
125 FR 55 145 - 130 - 290 230 204 140 340 147 15 27,5 60 7 46 252 112,5 M20

Order form
For hub “GR” order form please see TRASCO® GR base program GRFRD

Brake side hub

Type FRD
GRFR 48 Cd

Disc on request.
D Nr
B j6
Fa

Fb
G
E

WFRD “GRFRD” disc weight kg

A

Da

JFRD “GRFRD” moment of inertia kgm2

Nr Number of screws
P

S N S Direct drives (073.00)

17
V
 www.sitspa.com

TRASCO® couplings weight and moment of inertia

fig.1 fig.2 fig.3

GRS aluminum

fig.4 fig.5 fig.6

Spacer
GR GR GR GRALU GRALU GRALU GRB GRF GRF GRF
element
Type (A esecuz.) (B esecuz.) (AB esecuz.) (esecuz. A) (B esecuz.) (AB esecuz.) (CF) (CFN) (BFN)
GRS
fig. 1 fig. 1 fig. 1 fig. 1 fig. 1 fig. 1 fig. 2 fig. 3 fig. 4 fig. 5
fig. 6
W [kg] - 0,37 - - 0,14 - - 0,23 - - -
19/24
J [kgm2] - 0,0001 - - 0,00004 - - 0,00006 - - -
W [kg] 0,56 0,78 0,67 0,22 0,31 0,26 - 0,3 0,18 0,42 0,14
24/32
J [kgm2] 0,0002 0,0004 0,0003 0,00008 0,00015 0,00012 - 0,0003 0,00009 0,00018 0,00006
W [kg] 0,92 1,25 1,1 0,36 0,49 0,43 1 0,58 0,3 0,69 0,22
28/38
J [kgm2] 0,0005 0,0009 0,0007 0,0002 0,00034 0,00027 0,0007 0,0008 0,00021 0,00041 0,00013
W [kg] 1,97 2,5 2,25 0,77 0,98 0,9 1,7 0,8 0,313 0,933 0,35
38/45
J [kgm2] 0,0017 0,0027 0,002 0,0007 0,001 0,00084 0,0026 0,001 0,00047 0,00097 0,00035
W [kg] 3,1 3,85 3,46 - 1,5 - 2,8 1,41 0,76 1,81 0,51
42/55
J [kgm ]2
0,0035 0,006 0,0047 - 0,002 - 0,0036 0,004 0,0012 0,0023 0,0007
W [kg] 4,2 5,3 4,75 - 2 - 4,7 1,62 0,89 2,27 0,67
48/60
J [kgm2] 0,006 0,01 0,008 - 0,004 - 0,0078 0,005 0,0017 0,0035 0,001
W [kg] 6,4 7,8 7,1 - - - 5 2,82 1,47 3,55 0,97
55/70
J [kgm2] 0,012 0,02 0,015 - - - 0,012 0,012 0,0035 0,007 0,002
W [kg] 9,7 11,8 10,8 - - - 6,9 3,46 1,89 4,89 1,43
65/75
J [kgm ]2
0,024 0,035 0,03 - - - 0,014 0,017 0,0059 0,0123 0,004
W [kg] 15,2 20,8 18 - - - 14,8 5,03 3 7,86 2,2
75/90
J [kgm2] 0,051 0,082 0,07 - - - 0,065 0,032 0,0125 0,0275 0,009
W [kg] 26,2 30,2 28,2 - - - 35,4 7,9 4,87 13,54 3,9
90/100
J [kgm2] 0,13 0,17 0,15 - - - 0,162 0,073 0,033 0,108 0,025
W [kg] 32,6 - - - - - - 13,5 7,55 20,15 -
100/110
J [kgm ]2
0,22 - - - - - - 0,139 0,063 0,14 -
W [kg] 45,5 - - - - - - 18,8 10,15 27,05 -
110/125
J [kgm2] 0,38 - - - - - - 0,255 0,11 0,242 -
W [kg] 68,8 - - - - - - 27,4 14,9 40,9 -
125/145
J [kgm2] 0,76 - - - - - - 0,463 0,21 0,48 -

Weight and moments of inertia are calculated on hubs with max diameter bore.

Direct drives (073.00)

18
 www.sitspa.com

Tables for TRASCO® couplings with taper or splined bores

TRASCO 
ø

Taper 1:5 per: SAE splined profile

BOSCH - BUCHER- LEDUC - DÜSTERLOH
Code ø d + 0,05 b JS9 t2 + 0,1 Ik Code Size Head Pitch N. of teeth ⱔ
a1 9,85 2 1 11,5 PH-S 5/8” 14,28 16/32 9 30°
a2 16,85 3 1,8 18,5 Pl-S 3/4” 17,46 16/32 11 30°
a3 19,85 4 2,2 21,5 PB-S 7/8” 20,63 16/32 13 30°

a4 21,95 3 1,8 21,5 PB-BS 1” 23,81 16/32 15 30°

a5 24,85 5 2,9 26,5 PJ 1 1/8” 26,98 16/32 17 30°

a6 29,85 6 2,6 31,5 PC-S 1 1/4” 29,63 dic-24 14 30°

PA-S 1 3/8” 33,33 16/32 21 30°
a7 34,85 6 2,6 36,5
PD-S 1 1/2” 36,51 16/32 23 30°
a8 39,85 6 2,6 41,5
PE-S 1 3/4” 42,86 16/32 27 30°
PF 2 9/16” 63,5 16/32 40 30°
Taper 1:8 per:
ATOS - CASAPPA - GARBE LAHMEYER - JOTTI & STROZZI
MARZOCCHI - SALAMI - SAUER-FLUID
Code ø d + 0,05 b + 0,05 t2 + 0,1 Ik DIN 5482
b1 9,7 2,4 6 17
b2 11,6 3 7,1 16,5 Code Size Head Pitch N. of teeth Tolerance
b3 13 2,4 7,3 21 P 8217 A 17 x 14 14,4 1,6 9 0,6
b4 14 3 8,5 17,5 P 8228 A 28 x 25 26,25 1,75 15 0,302
b5 14,3 3,2 8,5 19,5 P 8230 A 30 x 27 28 1,75 16 0,327
b6 17,287 3,2 9,6 24 P 8235 A 35 x 31 31,5 1,75 18 0,676
b7 17,287 4 10,3 24 P 8240 A 40 x 36 38 1,9 20 0,049
b8 17,287 3 9,7 24 P 8245 A 45 x 41 44 2 22 0,181
b9 22,002 3,99 12,4 28 P 8250 A 50 x 45 48 2 24 0,181
b10 25,463 4,78 15,1 36
b11 25,463 5 15,5 36
b12 27 4,78 15,3 32,5
DIN 5480
b13 28,45 6 15,1 38,5
b14 33,176 6,38 18,8 44
Size Head Pitch N. of teeth
b15 33,176 7 18,8 44
20 x 1 x 18 x 7 H 18 1 18
b16 43,057 7,95 3,378 51
20 x 1,25 x 14 x 7 H 17,5 1,25 14
b17 41,15 8 3,1 42,5
25 x 1,25 x 18 x 7 H 22,5 1,25 18
30 x 2 x 13 x 7 H 26 2 13
Taper 1:10 per: 30 x 2 x 14 x 7 H 26 2 14
PARKER HANNIFIN NMF - TEVES
35 x 2 x 16 x 7 H 32 2 16
Code ø d + 0,05 b JS9 t2 + 0,1 Ik 40 x 2 x 18 x 7 H 36 2 18
c1 19,95 5 12,1 32 45 x 2 x 21 x 7 H 41 2 21
c2 24,95 6 14,1 45 48 x 2 x 22 x 9 H 44 2 22
c3 29,75 8 17 50 50 x 2 x 24 x 7 H 48 2 24

Direct drives (073.00)

19